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Pearls of Weber

A collection of posts by David Weber containing background information for his stories, collected and generously made available Joe Buckley.

Posted by David at 12:00am

Impeller rooms

Series: Honorverse

Date: October 22, 2002

Impeller rooms are cylindrical volumes located within the hull and
centered fore-and-aft on the impeller ring they serve. The diameters of civilian impeller
rooms are approximately 60% of the diameter of the impeller ring and approximately 1.2
times as long as they are across. They normally consist of a single, very large
compartment crammed with the required generators and node support hardware. Military
impeller rooms are approximately 85% as wide as the diameter of the impeller ring and
approximately 1.6 times as long as they are broad. They are also subdivided 
normally into quarters in smaller vessels (through CL), eighths (CA-BC), or twelfths
(DN-SD)  with the individual compartments heavily bulkheaded and armored to localize
and contain damage. Since the outbreak of the war, the RMN and GSN have begun dividing
impeller rooms in ships of the wall into 16ths  one for each beta node. These
individual compartments are arranged in clusters around the long axis of the ship with
each forming a smaller cylinder, bundled together with their fellows within the volume of
the overall "impeller room." Thus a modern RMN SD would refer to "Impeller
One" or "Impeller Two" to indicate (respectively) the forward or aft
impeller rooms, and then to "Impeller Eleven," "Impeller Twelve," or
"Impeller Thirteen" to indicate the subcompartments within Impeller One. (That
is, "Impeller 1.1" would be referred to as "Impeller Eleven,"
"Impeller 1.2" would be referred to as "Impeller Twelve," etc.)